若欲获得尺寸更小和质量更好的无缝管，必须采用冷轧、冷拔或者两者联合的方法。冷轧通常在二辊式轧机上进行，钢管在变断面圆孔槽和不动的锥形顶头所组成的环形孔型中轧制。冷拔通常在0.5～100T的单链式或双链式冷拔机上进行。
In order to obtain seamless pipes with smaller size and better quality, cold rolling, cold drawing or combination of the two methods must be adopted. Cold rolling is usually carried out on a two-roll mill. Steel tubes are rolled in an annular pass consisting of a circular groove with variable cross-section and a fixed conical head. Cold drawing is usually carried out on single-chain or double-chain cold-drawing machines of 0.5-100T.
优质碳素结构钢冷拨无缝管，主要用10号、20号、35号、45号钢制造，除保证化学成分和机械性能外要做水压试验，卷边、扩口、压扁等试验。
High quality carbon structural steel cold-drawn seamless tubes are mainly made of No. 10, No. 20, No. 35 and No. 45 steel. In addition to ensuring chemical composition and mechanical properties, hydraulic test, edge rolling, flattening and other tests are required.
冷拔无缝钢管重量计算公式:(外径-壁厚)*壁厚*0.02466=kg/米(每米的重量)
Formula for calculating the weight of cold-drawn seamless steel pipe: (outer diameter-wall thickness)* wall thickness * 0.02466 = kg/m (weight per meter)